Answer :

[tex]\begin{gathered} \cos \theta=\frac{Base}{Hypotenus} \\ \cos 42^{\circ}=\frac{x}{15} \\ x=15\times0.743 \\ x=11.147 \\ x=11.15 \\ x=11.2 \end{gathered}[/tex]

Hence. x = 11.2

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